drivers/hwtracing/intel_th/sth.c

   1 /*
   2  * Intel(R) Trace Hub Software Trace Hub support
   3  *
   4  * Copyright (C) 2014-2015 Intel Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  */
  15
  16 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
  17
  18 #include <linux/types.h>
  19 #include <linux/module.h>
  20 #include <linux/device.h>
  21 #include <linux/io.h>
  22 #include <linux/mm.h>
  23 #include <linux/slab.h>
  24 #include <linux/stm.h>
  25
  26 #include "intel_th.h"
  27 #include "sth.h"
  28
  29 struct sth_device {
  30         void __iomem    *base;
  31         void __iomem    *channels;
  32         phys_addr_t     channels_phys;
  33         struct device   *dev;
  34         struct stm_data stm;
  35         unsigned int    sw_nmasters;
  36 };
  37
  38 static struct intel_th_channel __iomem *
  39 sth_channel(struct sth_device *sth, unsigned int master, unsigned int channel)
  40 {
  41         struct intel_th_channel __iomem *sw_map = sth->channels;
  42
  43         return &sw_map[(master - sth->stm.sw_start) * sth->stm.sw_nchannels +
  44                        channel];
  45 }
  46
  47 static void sth_iowrite(void __iomem *dest, const unsigned char *payload,
  48                         unsigned int size)
  49 {
  50         switch (size) {
  51 #ifdef CONFIG_64BIT
  52         case 8:
  53                 writeq_relaxed(*(u64 *)payload, dest);
  54                 break;
  55 #endif
  56         case 4:
  57                 writel_relaxed(*(u32 *)payload, dest);
  58                 break;
  59         case 2:
  60                 writew_relaxed(*(u16 *)payload, dest);
  61                 break;
  62         case 1:
  63                 writeb_relaxed(*(u8 *)payload, dest);
  64                 break;
  65         default:
  66                 break;
  67         }
  68 }
  69
  70 static ssize_t sth_stm_packet(struct stm_data *stm_data, unsigned int master,
  71                               unsigned int channel, unsigned int packet,
  72                               unsigned int flags, unsigned int size,
  73                               const unsigned char *payload)
  74 {
  75         struct sth_device *sth = container_of(stm_data, struct sth_device, stm);
  76         struct intel_th_channel __iomem *out =
  77                 sth_channel(sth, master, channel);
  78         u64 __iomem *outp = &out->Dn;
  79         unsigned long reg = REG_STH_TRIG;
  80
  81 #ifndef CONFIG_64BIT
  82         if (size > 4)
  83                 size = 4;
  84 #endif
  85
  86         size = rounddown_pow_of_two(size);
  87
  88         switch (packet) {
  89         /* Global packets (GERR, XSYNC, TRIG) are sent with register writes */
  90         case STP_PACKET_GERR:
  91                 reg += 4;
  92         case STP_PACKET_XSYNC:
  93                 reg += 8;
  94         case STP_PACKET_TRIG:
  95                 if (flags & STP_PACKET_TIMESTAMPED)
  96                         reg += 4;
  97                 iowrite8(*payload, sth->base + reg);
  98                 break;
  99
 100         case STP_PACKET_MERR:
 101                 sth_iowrite(&out->MERR, payload, size);
 102                 break;
 103
 104         case STP_PACKET_FLAG:
 105                 if (flags & STP_PACKET_TIMESTAMPED)
 106                         outp = (u64 __iomem *)&out->FLAG_TS;
 107                 else
 108                         outp = (u64 __iomem *)&out->FLAG;
 109
 110                 size = 1;
 111                 sth_iowrite(outp, payload, size);
 112                 break;
 113
 114         case STP_PACKET_USER:
 115                 if (flags & STP_PACKET_TIMESTAMPED)
 116                         outp = &out->USER_TS;
 117                 else
 118                         outp = &out->USER;
 119                 sth_iowrite(outp, payload, size);
 120                 break;
 121
 122         case STP_PACKET_DATA:
 123                 outp = &out->Dn;
 124
 125                 if (flags & STP_PACKET_TIMESTAMPED)
 126                         outp += 2;
 127                 if (flags & STP_PACKET_MARKED)
 128                         outp++;
 129
 130                 sth_iowrite(outp, payload, size);
 131                 break;
 132         }
 133
 134         return size;
 135 }
 136
 137 static phys_addr_t
 138 sth_stm_mmio_addr(struct stm_data *stm_data, unsigned int master,
 139                   unsigned int channel, unsigned int nr_chans)
 140 {
 141         struct sth_device *sth = container_of(stm_data, struct sth_device, stm);
 142         phys_addr_t addr;
 143
 144         master -= sth->stm.sw_start;
 145         addr = sth->channels_phys + (master * sth->stm.sw_nchannels + channel) *
 146                 sizeof(struct intel_th_channel);
 147
 148         if (offset_in_page(addr) ||
 149             offset_in_page(nr_chans * sizeof(struct intel_th_channel)))
 150                 return 0;
 151
 152         return addr;
 153 }
 154
 155 static int sth_stm_link(struct stm_data *stm_data, unsigned int master,
 156                          unsigned int channel)
 157 {
 158         struct sth_device *sth = container_of(stm_data, struct sth_device, stm);
 159
 160         intel_th_set_output(to_intel_th_device(sth->dev), master);
 161
 162         return 0;
 163 }
 164
 165 static int intel_th_sw_init(struct sth_device *sth)
 166 {
 167         u32 reg;
 168
 169         reg = ioread32(sth->base + REG_STH_STHCAP1);
 170         sth->stm.sw_nchannels = reg & 0xff;
 171
 172         reg = ioread32(sth->base + REG_STH_STHCAP0);
 173         sth->stm.sw_start = reg & 0xffff;
 174         sth->stm.sw_end = reg >> 16;
 175
 176         sth->sw_nmasters = sth->stm.sw_end - sth->stm.sw_start;
 177         dev_dbg(sth->dev, "sw_start: %x sw_end: %x masters: %x nchannels: %x\n",
 178                 sth->stm.sw_start, sth->stm.sw_end, sth->sw_nmasters,
 179                 sth->stm.sw_nchannels);
 180
 181         return 0;
 182 }
 183
 184 static int intel_th_sth_probe(struct intel_th_device *thdev)
 185 {
 186         struct device *dev = &thdev->dev;
 187         struct sth_device *sth;
 188         struct resource *res;
 189         void __iomem *base, *channels;
 190         int err;
 191
 192         res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 0);
 193         if (!res)
 194                 return -ENODEV;
 195
 196         base = devm_ioremap(dev, res->start, resource_size(res));
 197         if (!base)
 198                 return -ENOMEM;
 199
 200         res = intel_th_device_get_resource(thdev, IORESOURCE_MEM, 1);
 201         if (!res)
 202                 return -ENODEV;
 203
 204         channels = devm_ioremap(dev, res->start, resource_size(res));
 205         if (!channels)
 206                 return -ENOMEM;
 207
 208         sth = devm_kzalloc(dev, sizeof(*sth), GFP_KERNEL);
 209         if (!sth)
 210                 return -ENOMEM;
 211
 212         sth->dev = dev;
 213         sth->base = base;
 214         sth->channels = channels;
 215         sth->channels_phys = res->start;
 216         sth->stm.name = dev_name(dev);
 217         sth->stm.packet = sth_stm_packet;
 218         sth->stm.mmio_addr = sth_stm_mmio_addr;
 219         sth->stm.sw_mmiosz = sizeof(struct intel_th_channel);
 220         sth->stm.link = sth_stm_link;
 221
 222         err = intel_th_sw_init(sth);
 223         if (err)
 224                 return err;
 225
 226         err = stm_register_device(dev, &sth->stm, THIS_MODULE);
 227         if (err) {
 228                 dev_err(dev, "stm_register_device failed\n");
 229                 return err;
 230         }
 231
 232         dev_set_drvdata(dev, sth);
 233
 234         return 0;
 235 }
 236
 237 static void intel_th_sth_remove(struct intel_th_device *thdev)
 238 {
 239         struct sth_device *sth = dev_get_drvdata(&thdev->dev);
 240
 241         stm_unregister_device(&sth->stm);
 242 }
 243
 244 static struct intel_th_driver intel_th_sth_driver = {
 245         .probe  = intel_th_sth_probe,
 246         .remove = intel_th_sth_remove,
 247         .driver = {
 248                 .name   = "sth",
 249                 .owner  = THIS_MODULE,
 250         },
 251 };
 252
 253 module_driver(intel_th_sth_driver,
 254               intel_th_driver_register,
 255               intel_th_driver_unregister);
 256
 257 MODULE_LICENSE("GPL v2");
 258 MODULE_DESCRIPTION("Intel(R) Trace Hub Software Trace Hub driver");
 259 MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@intel.com>");